As a DIYer how do you test your plumbing when you added pipes to existing plumbing?

Question

As far as I can understand you can do a pressure test when you just installed things
How do you do it when you are adding new lines (ex I am adding PEX lines to existing copper lines)
How do you test your drain for leaks ? I am adding or rerouting drains to an existing drain pipe in the basement. That will go under the slab. Is there any way to test this considering that the other end of the pipe is open -connected to the soil stack ?
Here is my situation. I will be adding the blue segments
4-new sink
1-old sink, piping still in place
3- new shower drain
2- connectionbetween existing drain and new drain for the new sink
6 -soil stack

Jack · Accepted Answer

Typically a "test tee" is installed at the lowest point possible in the main waste line. Then a test ball, an inflatable heavy duty balloon with a chain attached is inflated to block the pipe at that point. The vent is filled, many times from the roof, but in your case, you may have a place where the water can be added from the inside. I need to mention, the other drains are capped to contain all water to pressurize the whole vent/drain system.
As another mention, there is a test ball that is available that has the screw in plug with the balloon attached to it, so when the balloon is deflated the draining water is all contained in the pipe.

redlude97 · Answer

Pour a 5 gallon bucket of water down the drain and check the new fitting. The correct way is to use a ball plug at cleanout further down or at the soil stack but they are kibda spendy

As a DIYer how do you test your plumbing when you added pipes to existing plumbing?

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